package netty.c1;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;

/**
 * @author Zed
 * @description
 * @date 2022/10/25 21:52
 */
public class HelloServer {
    public static void main(String[] args) {
        //1.服务器端的启动器，负责组装netty组件，启动服务器
        new ServerBootstrap()
                //2.BossEventLoop,WorkEventLoop(selector,thread) group组
                .group(new NioEventLoopGroup())
                //3.选择服务器的ServerSocketChannel的实现
                .channel(NioServerSocketChannel.class)
                //4.boss负责处理连接worker(child) 负责处理读写，决定了worker(child)能处理哪些操作(handler)
                .childHandler(
                        //5.channel 代表和客户端进行数据读写的通道 Initializer初始化，负责添加别的handler
                        new ChannelInitializer<NioSocketChannel>() {
                            @Override
                            protected void initChannel(NioSocketChannel nioSocketChannel) throws Exception {
                                //6.添加具体handler
                                nioSocketChannel.pipeline().addLast(new StringDecoder());//将byteBuf转为字符串
                                nioSocketChannel.pipeline().addLast(new ChannelInboundHandlerAdapter() {//自定义handler
                                    @Override //读事件
                                    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                                        //打印上一步准备好的字符串
                                        System.out.println(msg);
                                    }
                                });
                            }
                        }).bind(8080);
    }
}
